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The Case of Canoly Canal, Calicut, Kerala, India

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The Case of Canoly Canal, Calicut, Kerala, India The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan Maintenance of Water Depth in Navigation Canals Versus Wetland System Loss- The Case of Canoly Canal, Calicut, Kerala, India Anjana Bhagyanathan, Kasthurba A.K National Institute of Technology, India 0266 The Asian Conference on Sustainability, Energy & the Environment 2013 Official Conference Proceedings 2013 Abstract Inland navigation canals built during the Colonial Period in India, more often than not, connect distinct watersheds, and rely upon wetlands to sustain water levels required for navigation. This study addresses the impacts such navigations canals have on the surface flow patterns of the wetlands by analysing the case of Canoly canal and Kottuli Wetlands in Calicut, Kerala. The canal was constructed during the British rule in 1848. The canal connects two watersheds, that of the Kallayi river and Mangala river, linking both the estuaries and is geographically aligned to direct the flow of water from two wetland systems, Kottuli and Perunthuruthi to sustain water levels. Two thirds of the northern reaches of the canal falls in the Mangala basin and the southern part in the Kallayi river basin. The Kottuli wetland covering an area of 87.04 hectares is one of the 115 wetlands identified by the Ministry of Environment and forests, Government of India under the National Wetland Conservation Programme. Surface water from the wetlands flows into the canal through weirs while the groundwater seepage is generalised along the length of the canal. Presently there are two proposed interventions for the canal. The Kerala Shipping and Inland Navigation Department’s proposal to revive the West Coast Canal System, of which Canoly canal is a part, includes deepening and widening of the canal to ensure flow and to hold passenger and cargo vessels. The Irrigation Department proposes to deepen Canoly Canal to improve the flood drainage and domestic sewage into the canal. This scenario was analysed with respect to the drainage pattern of the region. A topographical map of 2m contour interval was prepared based on Google Earth imagery using Autocad. Surface drainage flow patterns were demarcated using Arcmap. Flow dynamics between the wetlands and the canal was documented with field observations. The study showed that the canal changed the flow pattern from the wetland. The outflow to the Arabian Sea has been diverted to the canal, both from the surface and the aquifer. This channelizes the flow, thus increasing the outflow and hence decreasing the water holding capacity. Further deepening of Canoly canal as proposed by the Shipping and Inland Navigation Department can result in outflow of water from Kottuli wetlands into the canal both from the surface and the aquifer; the extent of wetland loss will depend on the depth proposed for the canal. This will change the hydrodynamics of the wetland on which is the most important determinant for establishment and maintenance of ecosystem processes. The study recommends that this balance of water exchange needs to be understood and impacts quantified before any intervention that can potentially alter the hydrodynamics. Successful water management requires the adoption of methodologies which consider all bodies of water within a basin as opposed to just one body in a system. iafor The International Academic Forum www.iafor.org 234 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan STUDY AREA Figure 1. Location N Kozhikode (Calicut), is on the south west coastal belt of India (Fig. 1). The coast of the district is about 71 Km and the area is 91 square kilometers. Kozhikode city is the nodal point for the four districts in the northern region of the state of Kerala. Kozhikode has traditionally been developed as a centre for forest and agro based industries. It has a high order of development in trade especially in food grains, marine products and spices. The city offers high potential for development of the entire northern region of the state. In view of this, Kozhikode is considered as one of the priority cities in the state. (District Urbanization Report, Kozhikode, 2011). The district has a humid tropical climate and an average annual rainfall of approximately 300mm (Bazak and Nazimuddin, 1988) Figure 2. Kozhikode district map and study area 235 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan Canoly Canal The Canoly Canal is part of the West Coast Canal system and is situated in the city of Kozhikode (See fig 2). The canal was constructed during the British rule in 1848 under the orders of the then Collector, the administrative head of the region, Mr. R. Canoly. The canal is 11.4 km long, the width ranges from 6m to 20m and water depth in the peak rain period varies from 0.5 to 2m (Harikumar et al, 2004). Most of the length of the canal, except the northern part, is heavily urbanized (Fig. 3). The canal connects the Kallayi River in the south and the Mangala River in the north, passing through Kottuli wetlands and Perunthuruthi wetlands Figure 3. Canoly Canal in Kozhikode Corporation Limits 236 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan WETLANDS Kottuli Wetlands Kottuli wetland is one of the largest eco- patches within the city limits. It is interlinked with Canoly canal which receives tidal influx from the estuary of river Kallayi. The wetland covering an area of 87.04 hectares is rich in species of mangroves and mangrove associates. It is reported to be rich in aquatic organisms and bird species. This wetland has been identified by the Ministry of Environment and Forests, Government of India, under National Wetland Conservation Programme. It is one of the 115 wetlands identified as on June 26, 2009 by the programme (Government of India, 2009). Figure 4a. Canoly Canal and wetlands location – Google satellite imagery 237 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan Perunthuruthi Wetlands The Perunthuruthi Wetlands cover an area of about 60 hectares, in two parts. The northern part is called Mangala River, though morphologically it is part of the estuary of Korappuzha. It receives tidal influx from Korappuzha River. The second part has no surface connection to Mangala River. It is located further south and east of Mangala river estuary. It experiences tidal influx and salinity consequently through the Canoly Canal. The area is under aquaculture. OBJECTIVE OF THE STUDY Canals meant for navigation, more often than not, connect distinct watersheds, and rely upon wetlands to sustain water levels required for navigation. Interventions meant for the canals are undertaken without considering the qualitative and quantitative impacts on the wetlands they are connected to. The Kerala Shipping and Inland Navigation Department’s proposal to revive the West Coast Canal System includes the deepening and widening of Canoly Canal. The National Bank for Agriculture and Rural Development (NABARD) is assisting the project to de-silt the Canoly canal and Kallayi River. The proposal to deepen Kallayi River to ensure flow from the canal to the river is funded by the River Management Fund. The objective of the project is to improve drainage in the city. This study addresses the impacts on hydrodynamics in Kottuli wetlands by the proposed deepening of Canoly Canal. A similar study undertaken on Mangala river and Perunthuruthi wetlands will help draw up development plans for land use and inland navigation that take into account the impacts on the wetlands. LIMITATIONS The study concerns itself only with the flow patterns deduced from topographical analysis and field observations. Qualitative aspects like pollution and salinity intrusion have not been dealt with here, but have been covered in other studies (Hamno and Pettersson, 2005). Quantitative aspects of the flow dynamics is a further area of study. TOPOGRAPHY The Canal is oriented to direct inflow from 4 water bodies: 1. Mangala River 2. Perunthuruthi Wetlands 3. Kottuli Wetlands 4. Kallayi River The highest elevation is found at Kunduparamba and lowest at Kottuli. (see Fig. 3 ) The red line shows the alignment of the canal and the dark ones are 5m contour lines. The blue areas represent water bodies. 238 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan Figure 4b. Topography of canal environs HYDROLOGY Surface Water Hydrology Analysis of the topography of the region shows that the stretch of the canal from Elathur to Kunduparamba falls in the Mangala river basin, and the rest, from Kunduparamba to Kallayi, falls in the Kallayippuzha (Kallayi river) basin. The canal passes through the ridge between 239 The Asian Conference on Sustainability, Energy and the Environment 2013 Official Conference Proceedings Osaka, Japan the two basins between Puthiyangadi and Kunduparamba; this is also the point that has maximum depth of the canal, minimum water depth and minimum tidal fluctuations. Tidal influx into the Canal is experienced for a distance of 3km into the canal from both ends, from Mangala River and Kallayi River (Hamno and Pettersson, 2005).Other than secondary tributaries of Kallayi river, it is the two wetlands – Kottuli and Perunthuruthi, that maintain the water level in the canal in the mid sections(Anjana, AKK and Deepak, 2013). Fresh water from the wetlands flows into the canal and into the Kallayi estuary and reaches the sea. The quantum of this outflow needs to be determined to estimate the extent of fresh surface water loss involved. Ground Water Hydrology Kozhikode district is underlain by a shallow unconfined sandy aquifer with thickness varying from 4m to 12m (Bazak and Nazimuddin, 1983). The depth to the groundwater varies over the year from 0.21 m and 4.5 (Bazak and Nazimuddin, 1988).
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